Analog signals on copper cable can be distorted by various fields. Which of the following is NOT a source of distortion?

In the context of distortions that affect analog signals on copper cables, it is essential to understand how different fields interact with these types of signals. Magnetic fields, radio waves, and alternating current (AC) fields are all sources of potential interference, as they can induce noise or unwanted signals that corrupt the original analog signal as it travels through the cable.

Electric fields, on the other hand, do not typically act as a source of distortion in the same manner. While electric fields can influence other factors in varied electrical contexts, they are less directly responsible for degrading analog signals than the more dynamic sources of distortion like magnetic fields, radio waves, or AC fields.

Therefore, the correct response to the question identifying a source that does not contribute to distortion of analog signals on copper cables is appropriately identified as electric fields.